With the engine running, look at the tensioner. If it doesn't move too much or violently, just replace the pulley. But if it is moving erratically, I suggest that you replace the assembly.
I have always replace the belt when I replace a pulley or tensioner. But it is up to you. If the belt is less than a year old, and you don't see any (much) cracks, and not glazed, you may re-use the belt. Otherwise, you should replace.
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Thursday, December 11th, 2008 AT 9:56 PM